645413 has 4 divisors (see below), whose sum is σ = 647148. Its totient is φ = 643680.

The previous prime is 645409. The next prime is 645419. The reversal of 645413 is 314546.

It is a happy number.

645413 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 314546 = 2 ⋅157273.

It can be written as a sum of positive squares in 2 ways, for example, as 293764 + 351649 = 542^2 + 593^2 .

It is a cyclic number.

It is not a de Polignac number, because 645413 - 2² = 645409 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56 + ... + 1137.

It is an arithmetic number, because the mean of its divisors is an integer number (161787).

2⁶⁴⁵⁴¹³ is an apocalyptic number.

It is an amenable number.

645413 is a deficient number, since it is larger than the sum of its proper divisors (1735).

645413 is a wasteful number, since it uses less digits than its factorization.

645413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1734.

The product of its digits is 1440, while the sum is 23.

The square root of 645413 is about 803.3760016331. The cubic root of 645413 is about 86.4196632344.

Adding to 645413 its reverse (314546), we get a palindrome (959959).

The spelling of 645413 in words is "six hundred forty-five thousand, four hundred thirteen".